Epson 1170, LQ-870 GND, BUSY, Signal, Description

					Interface Specifications
	Signal	Return	Signal	Direction	Description
	Pin	Pin
11		29	BUSY	OUT	A HIGH signal indicates that the printer
					cannot receive data. The signal goes
					HIGH in the following cases:
					1) During data entry (ea. char. time)
					2) During printing
					3) When PAUSE botton is pressed
					4) During printer-error state.
12		30	PE	OUT	A HIGH signal indicates that the printer is
					out of paper.
13		-	SLCT	OUT	Pulled up to 5 volts through 3.3 Kohm
					resistance.
14		-	AUTO	IN	When this signal is LOW, the paper is
			FEED		automatically fed 1 line after printing.
			R=T		(The signal level can be fixed to this by
					setting DIP switch 2-4 to ON.)
15		-	NC		Not used.
16		-	GND	-	Logic ground level.
17		-	C H A S S I S -		Printer’s chassis ground, which is
			GND		isolated from the logic ground.
18		-	NC		Not used.
19-30		-	GND	-	Twisted-pair return signal ground level.
31		16	INIT	IN	When this level becomes LOW, the
					printer controller is reset to its power-up
					state and the print buffer is cleared. This
					level is normally HIGH; its pulse width
					must be more than 50 microseconds at
					the receiving terminal.

32ERROR OUT This level becomes LOW when the printer is:

1)in paper out state

2) PAUSE

3) in error state.

Technical Specifications 7-11